From aec369dfbc423575b715a785121dc9e514c05e87 Mon Sep 17 00:00:00 2001
From: kichik <kichik@212acab6-be3b-0410-9dea-997c60f758d6>
Date: Wed, 6 Aug 2003 16:53:52 +0000
Subject: [PATCH] New Delphi unit for NSIS plug-ins by Bernhard Mayer

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@2791 212acab6-be3b-0410-9dea-997c60f758d6
---
 Contrib/ExDLL/exdll_with_unit.dpr |  37 +++++++++
 Contrib/ExDLL/nsis.pas            | 120 ++++++++++++++++++++++++++++++
 2 files changed, 157 insertions(+)
 create mode 100644 Contrib/ExDLL/exdll_with_unit.dpr
 create mode 100644 Contrib/ExDLL/nsis.pas

diff --git a/Contrib/ExDLL/exdll_with_unit.dpr b/Contrib/ExDLL/exdll_with_unit.dpr
new file mode 100644
index 00000000..f21a336b
--- /dev/null
+++ b/Contrib/ExDLL/exdll_with_unit.dpr
@@ -0,0 +1,37 @@
+{
+  NSIS ExDLL2 example
+  Original is ExDLL
+  (C) 2001 - Peter Windridge
+
+  Changed with delphi unit nsis.pas
+  by bernhard mayer
+
+  Tested in Delphi 7.0
+}
+
+library exdll;
+
+uses
+  nsis, windows;
+
+function ex_dll(hwndParent: HWND; string_size: integer; variables: PChar; stacktop: pointer):integer; cdecl;
+var
+  c: PChar;
+  buf: array[0..1024] of char;
+begin
+  // set up global variables
+  Init(hwndParent,string_size,variables,stacktop);
+
+  c:=GetUserVariable(INST_0);
+  MessageBox(g_hwndParent,c,'The value of $0',MB_OK);
+  PopString(@buf);
+  MessageBox(g_hwndParent,@buf,'pop',MB_OK);
+  PushString(PChar('Hello, this is a push'));
+
+  Result:=1;
+end;
+
+exports ex_dll;
+
+begin
+end.
diff --git a/Contrib/ExDLL/nsis.pas b/Contrib/ExDLL/nsis.pas
new file mode 100644
index 00000000..0a36baeb
--- /dev/null
+++ b/Contrib/ExDLL/nsis.pas
@@ -0,0 +1,120 @@
+{
+    Original Code from
+    (C) 2001 - Peter Windridge
+
+    Code in seperate unit and some changes
+    2003 by Bernhard Mayer
+
+    simple include this unit in your plugin project and export
+    functions as needed
+}
+
+
+unit nsis;
+
+interface
+
+uses
+  windows;
+
+type
+  VarConstants = (
+    INST_0,
+    INST_1,       // $1
+    INST_2,       // $2
+    INST_3,       // $3
+    INST_4,       // $4
+    INST_5,       // $5
+    INST_6,       // $6
+    INST_7,       // $7
+    INST_8,       // $8
+    INST_9,       // $9
+    INST_R0,      // $R0
+    INST_R1,      // $R1
+    INST_R2,      // $R2
+    INST_R3,      // $R3
+    INST_R4,      // $R4
+    INST_R5,      // $R5
+    INST_R6,      // $R6
+    INST_R7,      // $R7
+    INST_R8,      // $R8
+    INST_R9,      // $R9
+    INST_CMDLINE, // $CMDLINE
+    INST_INSTDIR, // $INSTDIR
+    INST_OUTDIR,  // $OUTDIR
+    INST_EXEDIR,  // $EXEDIR
+    INST_LANG,    // $LANGUAGE
+    __INST_LAST
+    );
+  TVariableList = INST_0..__INST_LAST;
+  pstack_t = ^stack_t;
+  stack_t = record
+    next: pstack_t;
+    text: PChar;
+  end;
+
+var
+  g_stringsize: integer;
+  g_stacktop: ^pstack_t;
+  g_variables: PChar;
+  g_hwndParent: HWND;
+
+procedure Init(hwndParent: HWND; string_size: integer; variables: PChar; stacktop: pointer);
+function PopString(str: PChar):integer;
+function PushString(str: PChar):integer;
+function GetUserVariable(varnum: TVariableList):PChar;
+
+implementation
+
+procedure Init(hwndParent: HWND; string_size: integer; variables: PChar; stacktop: pointer);
+begin
+  g_stringsize:=string_size;
+  g_hwndParent:=hwndParent;
+  g_stacktop:=stacktop;
+  g_variables:=variables;
+end;
+
+function PopString(str: PChar):integer;
+var
+  th: pstack_t;
+begin
+  if integer(g_stacktop^) = 0 then
+    begin
+    Result:=1;
+    Exit;
+    end;
+  th:=g_stacktop^;
+  lstrcpy(str,@th.text);
+  g_stacktop^ := th.next;
+  GlobalFree(HGLOBAL(th));
+  Result:=0;
+end;
+
+function PushString(str: PChar):integer;
+var
+  th: pstack_t;
+begin
+  if integer(g_stacktop) = 0 then
+    begin
+    Result:=1;
+    Exit;
+    end;
+  th:=pstack_t(GlobalAlloc(GPTR,sizeof(stack_t)+g_stringsize));
+  lstrcpyn(@th.text,str,g_stringsize);
+  th.next:=g_stacktop^;
+  g_stacktop^:=th;
+  Result:=0;
+end;
+
+function GetUserVariable(varnum: TVariableList):PChar;
+begin
+  if (integer(varnum) < 0) or (integer(varnum) >= integer(__INST_LAST)) then
+    begin
+    Result:='';
+    Exit;
+    end;
+  Result:=g_variables+integer(varnum)*g_stringsize;
+end;
+
+begin
+end.